A lot of work with
Andrew Leroux
PhD Student at Johns Hopkins
A lot of work with
Andrew Leroux
PhD Student at Johns Hopkins
In this presentation:
| Completed: good data | Completed: bad data | No response | Not asked | |
|---|---|---|---|---|
| n | 96701 | 7005 | 132800 | 266110 |
| Age at Initial Visit (mean (sd)) | 56.6 (7.8) | 55.2 (7.9) | 56.4 (8.0) | 57.5 (8.1) |
| Male (% Male) | 42255 (43.7) | 3156 (45.1) | 62601 (47.1) | 121151 (45.5) |
| Ethnicity (% Non-White) | 2983 (3.1) | 335 (4.8) | 7617 (5.8) | 16102 (6.1) |
Many people DIED before being able to be asked
| Completed: good data | Completed: bad data | No response | Not asked | |
|---|---|---|---|---|
| Overall health (%) | ||||
| Excellent | 20987 (21.8) | 1464 (21.0) | 21583 (16.3) | 37849 (14.4) |
| Good | 57849 (60.0) | 4057 (58.1) | 78968 (59.7) | 148196 (56.2) |
| Fair | 15149 (15.7) | 1261 (18.0) | 26669 (20.2) | 62313 (23.6) |
| Poor | 2482 (2.6) | 205 (2.9) | 4969 (3.8) | 15124 (5.7) |
(Hees et al. 2014)
Heatmap of 2000 randomly sampled people
“We invited some participants to wear an activity monitor for a week, four times a year. … finished in early 2019.”
“We removed non-wear time, defined as consecutive stationary episodes lasting for at least 60 minutes where all three axes had a standard deviation of less than 13.0 m\(g\)”
Doherty et al. (2017)
“Here, 13 m\(g\) was selected just above the empirically derived baseline (noise) standard deviation of 10 m\(g\) to retain only nonmovement periods.” Hees et al. (2014)
Doherty, Aiden, Dan Jackson, Nils Hammerla, Thomas Plötz, Patrick Olivier, Malcolm H Granat, Tom White, et al. 2017. “Large Scale Population Assessment of Physical Activity Using Wrist Worn Accelerometers: The Uk Biobank Study.” PloS One 12 (2): e0169649.
Hees, Vincent T van, Zhou Fang, Joss Langford, Felix Assah, Anwar Mohammad, Inacio CM da Silva, Michael I Trenell, Tom White, Nicholas J Wareham, and Søren Brage. 2014. “Autocalibration of Accelerometer Data for Free-Living Physical Activity Assessment Using Local Gravity and Temperature: An Evaluation on Four Continents.” Journal of Applied Physiology 117 (7): 738–44.